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Finding the Fourth Proportional to 279,976.54, 420,024.35 and 90,447.78

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Solution

The fourth proportional to 279,976.54, 420,024.35 and 90,447.78 is: 135,690.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,976.54 : 420,024.35 = 90,447.78 : x
  2. Step 2: Convert to fraction form
    279,976.54/420,024.35 = 90,447.78/x
  3. Step 3: Cross multiply
    279,976.54x = 420,024.35 × 90,447.78
  4. Step 4: Simplify right side
    279,976.54x = 37,990,270,003.44
  5. Step 5: Solve for x
    x = 37,990,270,003.44/279,976.54
  6. Step 6: Final answer
    x = 135,690.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.